Python xfloat with division by zero returning inf.

xfloat.py

'''
This is a partial solution because several other operator methods 
should be overridden for absolute consistency. 

The complete list is at:

http://docs.python.org/2/reference/datamodel.html#emulating-numeric-types
http://docs.python.org/3/reference/datamodel.html#emulating-numeric-types
'''
import math


class xfloat(float):
    def __add__(self, n):
        return xfloat(super(xfloat, self).__add__(n))

    def __sub__(self, n):
        return xfloat(super(xfloat, self).__sub__(n))

    def __mul__(self, n):
        return xfloat(super(xfloat, self).__mul__(n))

    def __div__(self, d):
        try:
            return xfloat(super(xfloat, self).__div__(d))
        except ZeroDivisionError:
            return self * float('inf')


def main():
    a = xfloat(-math.pi)
    print a / 1.0
    print a / 0.0
    b = a * 2
    print b
    print b / 0.0
    c = float(b)
    print c / 0.0

if __name__ == '__main__':
    main()